Get tech support or a refund then.

I think I've already posted the FR chart showing no difference in FR between 252 and 717 with SR-007 at a very high 105 dB.

The 007 is more sensitive than other models according to its specs. On another forum, the 007 was level matched across different amps to a quite high 105 dB. There was no difference in frequency response between 252s and 717. It's time for big amp proponents to explain the value, and in clearer...

Headphones don't image as music is typically not made for them. Soundstage is a perception of the 3-7 kHz frequencies. Stax models are flatter than not so soundstage is much less present than DF compensated headphones. You can always jack up the soundstage with the ED-1 filter implemented in...

Recoat them + check solder joints if you can't organize paid service.

Can you speculate whether your L700 is ported?

Owners of the new series: Does your set have an acoustic seal?   Do they spit if you take them off quickly? Does bass extend completely?

   

  Not even the BHSE can 100% tame the new Lambdas.

  Carbon minimum.

Hi Michgelsen, The hum is coming from the unit while the sound output is completely clean. I just want to make sure the 323S transformer is not delaminating or something. Do Stax amps quietly hum or are they typically silent?

I've noticed a quiet hum coming from my 323S that I don't recall having heard before. Sound output is unaffected. It is powered from a 240-100 V 100 W rated toroidal transformer. Should I be concerned?

  I had a buzzy distortion when listening to the 307 at high loudness. I swapped the headphones back to front and it remained on the left side only. It's actually my left ear's acoustic reflex causing it to what I can tell.

  I've gotta tell you, my thoughts match yours. I bought the 3170 because I was suffering less with EQed Samsung buds than my dynamic pair. I was going to feed the Stax a DF EQ and be happy with an accurate, channel matched system that was free of complaints.   It didn't turn out that way...

  Just yesterday I believed I had an EQ applied when the master was off. It took me fifteen minutes to realise. We haven't applied the standard measurements yet. They may well be inadequate.   Quote: There has been no argument made previously about testing the behaviour of different...

    How do we then find the difference?

  Now if only someone had a wide range of Stax amps that they could loan to someone like Tyll. Tyll could produce a chart recording the FR variation of all these amps relative to the KGSSRE at 90, 100 and 106 dB. It'd make an interesting article.

   

Hmm, looking at off-site measurements of the Omega, they indeed do appear to be diffuse field equalized as fuzzzy suggested. They must sound very distinct compared to the rest of the range.

Rin Choi 's blog investigates the pro, signature and 207 models combined with ED-1, so please take a look. The signature EQ is not a diffuse field equalization.  I've reduced the 10k notch and introduced a low Q bass boost but at this moment I am using the native because of JACK issues. ED-1 is...

  Is this the case? The O2 shows further distance from DF target than lambdas.   The ED-1, by the way, is still compatible with all the lambda range. The resulting response just has a slight downward slope compared to the lambda pro. I switch between using EQ and native when listening to my...

Hi Fuzzy,   Rin Choi and MLudovic on HF have done great work around the ED-1 diffuse field equalization developed by Stax and IRT in the 80s. Rin Choi on his blog has analyzed the ED-1 thoroughly and MLudovic has obtained the parameters for DF EQ so that you may reproduce it in software.  ...

Thank you jcx.   Would the ideal measurement be V/us @ 100 pF 20 kHz?   Is it possible to calculate the peak linear SPL of these amplifiers using their stated maximum output voltage @ 1 kHz?   Regards.

I esteem the 3170 I use very highly. I'm after good knowledge of what I enjoy.     Quote:   Just recently you were confused over the topology of the BH. To be honest, you would be sent packing from any other hobby forum that did not involve audio.

Hi Kevin,   How do we quantify the performance of an electrostat amplifier? What unit of measurement should be used?   Also, as it is a seeming consensus that the SR-007 has greater amplification requirements, how do we measure this? It specifies the same 100dB / 100V r.m.s. 1 kHz and a...